Issue a referral URL on site A with a unique one-time referral code in the URI, e.g. http://siteb.domain.com?refer=xxxxxxx
Require visitors to site B have a valid referral field in the URI.
Let referral

Manage projects of all sizes how you want. Great for personal to-do lists, project milestones, team priorities and launch plans.
- Combine task lists, docs, spreadsheets, and chat in one
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Dave, here is the background on that. At my own site, on the average I see perhaps one referral logged for every 40 accesses to a .HTML file. And yet the accessors are going directly to the desired content, not to the home page, as evidenced again by the log. This implies to me that they are being referred from somewhere, and yet there's no referral logged.

Clients SHOULD NOT include a Referrer header field in a (non-secure) HTTP request if the referral page was transferred with a secure protocol.

So blame it on the RFC. Any site which uses HTTP by default, but gets referrals from sites using HTTPS by default, can expect, for the most part, nothing in the referral fields. Most modern browsers comply with this, it appears, since I very, very seldom see referrals from Google or Bing -- and the few I do see appear to be from older browsers.

I'll have to check on that. Most of the pages I was thinking of are HTTPS connections. And come to think of it, where I thought 'we' should be getting 'referers' we aren't so maybe we'll have to change the links to 'https'.

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